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# [22. Generate Parentheses](https://leetcode.com/problems/generate-parentheses/)
## 题目
Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.
For example, given n = 3, a solution set is:
[
"((()))",
"(()())",
"(())()",
"()(())",
"()()()"
]
## 题目大意
给出 n 代表生成括号的对数,请你写出一个函数,使其能够生成所有可能的并且有效的括号组合。
## 解题思路
- 这道题乍一看需要判断括号是否匹配的问题,如果真的判断了,那时间复杂度就到 O(n * 2^n)了,虽然也可以 AC但是时间复杂度巨高。
- 这道题实际上不需要判断括号是否匹配的问题。因为在 DFS 回溯的过程中,会让 `(``)` 成对的匹配上的。